diff --git a/libraries/kotlin.test/wasm/js/src/main/kotlin/kotlin/test/ExternalFrameworkAdapter.kt b/libraries/kotlin.test/wasm/js/src/main/kotlin/kotlin/test/ExternalFrameworkAdapter.kt
new file mode 100644
index 00000000000..8beadf371ea
--- /dev/null
+++ b/libraries/kotlin.test/wasm/js/src/main/kotlin/kotlin/test/ExternalFrameworkAdapter.kt
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package kotlin.test
+
+internal external interface ExternalFrameworkAdapter : JsAny {
+    fun suite(name: String, ignored: Boolean, suiteFn: () -> Unit)
+    fun test(name: String, ignored: Boolean, testFn: () -> JsAny?)
+}
+
+private fun createExternalFrameworkAdapter(
+    suiteFn: (String, Boolean, () -> Unit) -> Unit,
+    testFn: (String, Boolean, () -> JsAny?) -> Unit
+): ExternalFrameworkAdapter = js("{ return { suite: suiteFn, test: testFn } }")
+
+private class ExternalAdapterWrapper(private val externalAdapter: ExternalFrameworkAdapter) : FrameworkAdapter {
+    override fun suite(name: String, ignored: Boolean, suiteFn: () -> Unit) = externalAdapter.suite(name, ignored, suiteFn)
+    override fun test(name: String, ignored: Boolean, testFn: () -> Any?) = externalAdapter.test(name, ignored, { testFn()?.toJsReference() })
+}
+
+internal fun FrameworkAdapter.externalize(): ExternalFrameworkAdapter =
+    createExternalFrameworkAdapter(
+        suiteFn = this::suite,
+        testFn = { name, ignored, testFn -> this.test(name, ignored, { testFn() }) }
+    )
+
+internal fun ExternalFrameworkAdapter.internalize(): FrameworkAdapter = ExternalAdapterWrapper(this)
diff --git a/libraries/kotlin.test/wasm/js/src/main/kotlin/kotlin/test/JasmineLikeAdapter.kt b/libraries/kotlin.test/wasm/js/src/main/kotlin/kotlin/test/JasmineLikeAdapter.kt
index 1af68e5e0bd..3635681332e 100644
--- a/libraries/kotlin.test/wasm/js/src/main/kotlin/kotlin/test/JasmineLikeAdapter.kt
+++ b/libraries/kotlin.test/wasm/js/src/main/kotlin/kotlin/test/JasmineLikeAdapter.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -68,25 +68,3 @@ internal class JasmineLikeAdapter : FrameworkAdapter {
     }
 }
 
-internal external interface ExternalFrameworkAdapter : JsAny {
-    fun suite(name: String, ignored: Boolean, suiteFn: () -> Unit)
-    fun test(name: String, ignored: Boolean, testFn: () -> JsReference<Any>?)
-}
-
-private fun createExternalJasmineLikeAdapter(
-    suiteFn: (String, Boolean, () -> Unit) -> Unit,
-    testFn: (String, Boolean, () -> JsReference<Any>?) -> Unit
-): ExternalFrameworkAdapter = js("{ return { suite: suiteFn, test: testFn } }")
-
-private class ExternalAdapterWrapper(private val externalAdapter: ExternalFrameworkAdapter) : FrameworkAdapter {
-    override fun suite(name: String, ignored: Boolean, suiteFn: () -> Unit) = externalAdapter.suite(name, ignored, suiteFn)
-    override fun test(name: String, ignored: Boolean, testFn: () -> Any?) = externalAdapter.test(name, ignored, { testFn()?.toJsReference() })
-}
-
-internal fun JasmineLikeAdapter.externalize(): ExternalFrameworkAdapter =
-    createExternalJasmineLikeAdapter(
-        suiteFn = this::suite,
-        testFn = { name, ignored, testFn -> this.test(name, ignored, { testFn()?.get() }) }
-    )
-
-internal fun ExternalFrameworkAdapter.internalize(): FrameworkAdapter = ExternalAdapterWrapper(this)
diff --git a/libraries/kotlin.test/wasm/js/src/test/kotlin/AdapterTransformerTest.kt b/libraries/kotlin.test/wasm/js/src/test/kotlin/AdapterTransformerTest.kt
new file mode 100644
index 00000000000..ffcf25c3ac1
--- /dev/null
+++ b/libraries/kotlin.test/wasm/js/src/test/kotlin/AdapterTransformerTest.kt
@@ -0,0 +1,51 @@
+/*
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package kotlin.test.tests
+
+import kotlin.test.*
+
+private fun wrapAdapter(externalAdapter: ExternalFrameworkAdapter): ExternalFrameworkAdapter = js("""{
+    return {
+        suite: (name, ignored, suiteFn) => externalAdapter.suite(name, ignored, suiteFn),
+        test: (name, ignored, testFn) => externalAdapter.test(name, ignored, () => 'overridden')
+    };
+}""")
+
+private class TestAdapter : FrameworkAdapter {
+    var testResult: Any? = null
+    override fun suite(name: String, ignored: Boolean, suiteFn: () -> Unit) = suiteFn()
+    override fun test(name: String, ignored: Boolean, testFn: () -> Any?) { testResult = testFn() }
+}
+
+class AdapterTransformerTest {
+    @Test
+    fun loopAround() {
+        val frameworkAdapter = TestAdapter()
+
+        val adapter = frameworkAdapter.externalize().internalize()
+        adapter.test("someTest", false) { "abc".toJsString() }
+        check(frameworkAdapter.testResult !is String)
+        check(frameworkAdapter.testResult.toString() == "abc")
+
+        adapter.test("someTest", false) { "abc" }
+        check(frameworkAdapter.testResult is String)
+        check(frameworkAdapter.testResult == "abc")
+
+        adapter.test("someTest", false) { 42 }
+        check(frameworkAdapter.testResult is Int)
+        check(frameworkAdapter.testResult == 42)
+    }
+
+    @Test
+    fun wrappedAdapter() {
+        val adapter = TestAdapter()
+
+        val roundTripAdapter = wrapAdapter(adapter.externalize()).internalize()
+        roundTripAdapter.test("someTest", false) { "abc".toJsString() }
+        check(adapter.testResult !is String)
+        check(adapter.testResult.toString() == "overridden")
+    }
+}
\ No newline at end of file